From 9b2089197272fdd85156725440e71c69733bbf38 Mon Sep 17 00:00:00 2001 From: Nestpebble Date: Thu, 30 Jan 2025 22:39:17 +0000 Subject: [PATCH] Updated readme to include all data from Ebyte --- .../diy/nrf52_promicro_diy_tcxo/readme.md | 24 ++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/variants/diy/nrf52_promicro_diy_tcxo/readme.md b/variants/diy/nrf52_promicro_diy_tcxo/readme.md index 123e7a761..9f49874f6 100644 --- a/variants/diy/nrf52_promicro_diy_tcxo/readme.md +++ b/variants/diy/nrf52_promicro_diy_tcxo/readme.md @@ -1,10 +1,19 @@ ## Notes ### General -The pinout is contained in the variant.h file, and a [generic schematic](./Schematic_Pro-Micro_Pinouts%202024-12-14.pdf) is located in this directory. Note that RXEN is not required if the selected module already has internal RF switching, or if external RF switching logic is already applied. +The pinout is contained in the variant.h file, and a [generic schematic](./Schematic_Pro-Micro_Pinouts%202024-12-14.pdf) is located in this directory. + +#### Note on DIO2, RXEN, TXEN, and RF switching +Several modules require external switching between transmit (Tx) and receive (Rx). This can be achieved using several methods: +1) Link the TXEN pin on the radio module to DIO2 on the same module, and then connect RXEN on the radio module to pin 0.17 on the Pro-Micro. +2) Use DIO2 to drive a logic inverter, so that when DIO2 is `high`, RXEN is `low`, and vice versa. +3) Use DIO2 to drive a pair of MOSFETs or transistors to supply the same function. + +RXEN is not required to be connected if the selected module already has internal RF switching, or if external RF switching logic is already applied. +Also worth noting that the Seeed WIO SX1262 in particular only has RXEN exposed (marked RF_SW) and has the DIO2-TXEN link internally. ### LR1121 modules -The CDEbyte implementation of the LR1121 is contained in their E80 module. Naturally, CDEbyte have chosen to ignore the generic Semtech impelementation of the RF switching logic and have their own table, which is located at the bottom of the page [here](https://www.cdebyte.com/products/E80-900M2213S/2#Pin), and reproduced below for posterity: +The CDEbyte implementation of the LR1121 is contained in their E80 module. Naturally, CDEbyte have chosen to ignore the generic Semtech impelementation of the RF switching logic and have their own table, which is located at the bottom of the page [here](https://www.cdebyte.com/products/E80-900M2213S/2#Pin), and reflected on page 6 of their user manual, and reproduced below: | DIO5/RFSW0 | DIO6/RFSW1 | RF status | | ---------- | ---------- | ----------------------------- | @@ -13,7 +22,16 @@ The CDEbyte implementation of the LR1121 is contained in their E80 module. Natur | 1 | 0 | TX (Sub-1GHz high power mode) | | 1 | 1 | TX（2.4GHz） | -If you want to use the Semtech default, the values are (taken from [here](https://github.com/Lora-net/SWSD006/blob/73f59215b0103de7011056105011c5f5cc47f1e8/lib/app_subGHz_config_lr11xx.c#L145C1-L154C4)): +However, looking at the sample code they provide on page 9, the values would be: + +| DIO5/RFSW0 | DIO6/RFSW1 | RF status | +| ---------- | ---------- | ----------------------------- | +| 0 | 1 | RX | +| 1 | 1 | TX (Sub-1GHz low power mode) | +| 1 | 0 | TX (Sub-1GHz high power mode) | +| 0 | 0 | TX（2.4GHz） | + +If you want to use the Semtech default, the values are (taken from [here](https://github.com/Lora-net/SWSD006/blob/v2.6.1/lib/app_subGHz_config_lr11xx.c#L145-L154)):